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© 2003 directed electronics, inc.
ly found in Ford, Mazda, Chrysler and GM vehicles. The door
lock switch or door key cylinder may contain either one or two
resistors.
■
TTyyppee HH::
Negative (-) multiplex. The system is most common-
ly found in Ford, Mazda, Chrysler and GM vehicles. The door
lock switch or door key cylinder may contain either one or two
resistors.
at the switch
■ Three-wire switches will have either a constant ground input or
a constant (+)12V input, along with the pulsed lock and unlock
outputs to the factory relays.
■ Many BMW’s and VW’s have no external switch. The switches
are inside the actuator, and instead of pulsing, the proper wires
will flip-flop from (+)12V to (-) ground as the door locks are
operated.
■ Direct-wired switches will have a (+)12V constant input and one
or two (-) ground inputs, along with two output leads going
directly to the lock motors.
